N-UNCOUNT [usually NOUN n] (铜管乐器开或闭所发出的）哇音;(电子乐器，尤指电吉他的)哇音 In music, wah-wah is used to describe the sound produced by covering and uncovering the open end of a brass instrument. This sound can also be produced electronically, especially when playing the electric guitar. (铜管乐器开或闭所发出的）哇音;(电子乐器，尤指电吉他的)哇音